优化

src/modules/first-leg/utils/priceEstimate.ts

@@ -0,0 +1,54 @@
+const KG_PER_CBM = 167
+const KG_PER_BILLABLE_CBM = 363
+
+function formatFormulaNumber(value: number) {
+  return value.toLocaleString('zh-CN', { maximumFractionDigits: 6, useGrouping: false })
+}
+
+export interface PriceEstimateBreakdown {
+  actualLabel: string
+  actualQuantity: number
+  convertedLabel: string
+  convertedQuantity: number
+  convertedFormula: string
+  chargeableLabel: string
+  basisLabel: string
+}
+
+/**
+ * Explains the server's current first-leg chargeable-quantity rules. The server
+ * response remains authoritative for the final chargeable quantity and amount.
+ */
+export function createPriceEstimateBreakdown(
+  actualWeightKg: number,
+  actualVolumeCbm: number,
+  chargeUnit: string,
+): PriceEstimateBreakdown | null {
+  if (chargeUnit === 'KG') {
+    const volumeWeightKg = actualVolumeCbm * KG_PER_CBM
+    return {
+      actualLabel: '实际毛重',
+      actualQuantity: actualWeightKg,
+      convertedLabel: '体积重量',
+      convertedQuantity: volumeWeightKg,
+      convertedFormula: `${formatFormulaNumber(actualVolumeCbm)} m³ × ${KG_PER_CBM}`,
+      chargeableLabel: '计费重量',
+      basisLabel: actualWeightKg >= volumeWeightKg ? '采用实际毛重' : '采用体积重量',
+    }
+  }
+
+  if (chargeUnit === 'CBM') {
+    const convertedVolumeCbm = actualWeightKg / KG_PER_BILLABLE_CBM
+    return {
+      actualLabel: '实际体积',
+      actualQuantity: actualVolumeCbm,
+      convertedLabel: '重量折算体积',
+      convertedQuantity: convertedVolumeCbm,
+      convertedFormula: `${formatFormulaNumber(actualWeightKg)} KG ÷ ${KG_PER_BILLABLE_CBM}`,
+      chargeableLabel: '计费体积',
+      basisLabel: actualVolumeCbm >= convertedVolumeCbm ? '采用实际体积' : '采用重量折算体积',
+    }
+  }
+
+  return null
+}